Why Aren't All Masks Equally Effective?

Ever noticed how some masks seem to stop germs better than others? Scientists test masks with teeny-tiny salt particles that work like viruses and bacteria. But here's a curious thing: not all masks block germs the same way. Adding more layers or using different materials doesn't guarantee you'll get a super-effective mask. Experts are puzzled and want to figure out why masks don't all work the same. They're not after a perfect mask; they want to know why some masks work better than others.Imagine if masks were like cars. A car with more seats isn't always the best at blocking germs. Similarly, more layers in a mask don't always mean it's the best. Experts are trying to understand why masks behave differently. Wouldn't it be great if we could understand why some masks are better at blocking germs? This could help us make better masks in the future.